See Lyman v. Lyman (1989) 13 FamLR at 18, Jones v. Grech [2001] NSWCA 208, 27 FamLR 711 at [29].
26 The first of those steps has been dealt with above, and needs no further discussion.
27 As regards the second and third steps, it is established that, whereas in determining an appropriate order for property settlement under s.79 of the Family Law Act 1975 (Cwth) the Family Court can take into account a wide range of circumstances relevant to the justice of the case, a court in making an order under s.20 of the Act is limited to considering what is just and equitable having regard to the contributions of the parties, in all the circumstances: Evans v. Marmont (1997) 42 NSWLR 70. In the leading judgment in that case, Gleeson CJ and McLelland CJ in Eq. noted that there were at least two major reasons for such difference, and they continued (at 78-79):
The first relates to the limited purpose of the New South Wales Act, which will be explained below. The second relates to the essential legal nature of marriage, which is referred to in the Family Law Act (s.43) as an institution, and which is given by that Act its common law meaning as being "the union of a man and woman to the exclusion of all others voluntarily entered into for life". Marriage involves matters of legal status and public commitment. Included in the formal commitment undertaken by people who marry, and reflected in s.72 of the Family Law Act, is a mutual undertaking by each party to maintain the other to the extent of their respective abilities and needs. No such commitment need be involved in a de facto relationship; hence the substantial differences between the way in which the two Acts address the subject of maintenance.
28 Accordingly, since the contributions are so central to the decision, it is particularly important in the reasons for making or refusing an order to identify and evaluate these contributions.
29 This is not a narrow or purely mathematical process. In many cases, it may be appropriate simply to treat the contributions of the parties during the relationship as equal, even though the nature of the contributions are different, although of course there is no presumption of law to that effect, and this assessment depends on a judgment being made that the quality of the contribution of each, in his or her own sphere, deserves to be considered as equal: Mallett v. Mallett (1984) 156 CLR 605. However, that judgment is one that often may be readily reached: Marriage of Ferraro (1992) 16 FamLR 1, Marriage of Clauson (1995) 18 FamLR 693, Jones v. Grech.
30 In addition to the contributions of the parties during a relationship, regard needs also to be had to initial contributions. In cases decided under the Family Law Act, there has developed what is sometimes referred to as "the erosion principle". That principle was considered and explained in Pierce. That case concerned a marriage of eight years, preceded by two years' cohabitation. The assets of the parties were found to be $319,190.00. At the time of marriage, the husband had assets to the value of $226,000.00, while the wife had assets with an estimated value of $11,500.00. The trial judge considered the parties' contributions during cohabitation to be equal. He gave some additional weight to the greater initial contribution of the husband, but said that the relevance of this was diminished due to the length of cohabitation, a little over ten years, and the substantial other contributions. He took into account the husband's contribution in caring for the children since separation, and assessed the contributions of the parties to be 55:45 in favour of the husband. The Full Court allowed an appeal, holding that the trial judge erred in his assessment of the contributions of the parties in that he failed to attach sufficient weight to the greater initial contribution of the husband and his post-separation contribution in caring for the children. The Full Court held that, having regard to the facts as found by the trial judge, the result embodied in his reasons was unreasonable; and that in re-exercising the discretion, the contribution to the parties should be assessed at 70% to the husband and 30% to the wife, with a further 5% adjustment in favour of the husband for factors under s.75(2) of the Family Law Act.
31 In dealing with the so-called "erosion principle", the Full Court (Ellis, Baker and O'Ryan JJ) said this (at [25]-[28]):
25. In addition to referring to a short passage from the judgment of Fogarty J in Money and Money (1994) FLC 92-485, the trial judge noted that the passage was cited with approval by the Full Court (Nicholson CJ, Baker and Tolcon JJ) in Bremner and Bremner (1995) FLC 92-560.